Planet explains Subaru's Active Torque Vectoring in terms you can understand!

In a curve, your Subaru can apply braking pressure to the inside front wheel. 

In a nutshell:
Subaru Active Torque Vectoring (ATV) applies light brake pressure to the inside front wheel as your Subaru car carves a corner, which pushes more power to the outside front wheel, reducing wheel spin and sharpening handling. 

Standard on:
2015 and later Outback, Legacy, WRX, and STi

Optional on:
2017 and later Impreza and Forester.

More detail for the gearheads:
ATV is part of Subaru's Vehicle Dynamics Control system, which monitors where the car is going and the speed at which all four wheels are rotating.  VDC helps prevent skids.  If your Subaru strays from your intended direction (due to sand, ice, rain-slicked pavement, etc.) VDC can reduce engine power and apply brake pressure to individual wheels, thus straightening your path.  The Active Torque Vectoring system uses VDC hardware to monitor the path of your Subaru and apply braking pressure to either front wheel as required. 

Subaru could have used a limited-slip front differential to sharpen handling.  (Subaru's supercar, the STi, uses one).  With ATV, Subaru ingeniously employed equipment that was already on the car, saving weight, cost, and maintenance.

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Planet Subaru helps those from Cambridge, Boston, Plymouth, and Cape Cod better understand Subaru's Active Torque Vectoring technology.